feat: add tests, update configs, fix state.py return, update gitignore

docker-compose.yml

@@ -8,7 +8,11 @@ services:
       - BAIKAL_URL=${BAIKAL_URL}
       - BAIKAL_USER=${BAIKAL_USER}
       - BAIKAL_PASS=${BAIKAL_PASS}
-      - SYNC_FREQUENCY=5 # Minutes
-    # If your Baikal is on the same host, you might need network_mode: "host" 
-    # or ensure they share a network.
-    # network_mode: "host" 
+      - SYNC_FREQUENCY=${SYNC_FREQUENCY:-5}
+      - CALENDAR_ID=${CALENDAR_ID:-}
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8081/health')"]
+      interval: 60s
+      timeout: 10s
+      retries: 3
+      start_period: 5s